HP ProLiant 1200 Eliminating Single Points of Failure and Enabling Rapid Recov - Page 8

The Online Storage Controller Recovery Option is a natural partner to the PCI Hot Plug

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ECG0094/1197 Eliminating Single Points of Failure (cont.) ... With fault tolerance enabled, SMART-2 Array Controllers keep systems online and accessible after a drive failure and provide automatic recovery with online sparing. Hot plug drives can be replaced without powering the system down. In addition, the SMART-2 Array Controllers support redundant array of independent disks (RAID) architecture. RAID is a way of storing data across multiple drives in redundant configurations or with data striping and parity checking. The On-line Capacity Expansion feature of the SMART-2 Array Controller allows server storage capacity to be expanded without taking the server down. Prior to this innovation, expanding storage capacity attached to an array controller required a time-consuming backup/reconfigure/restore cycle. Performance, configuration, and fault management are provided by Compaq Insight Manager and SMART-2 Array Controllers are covered by the Compaq Pre-Failure Warranty. For more information about the SMART-2 Array Controller, see technology brief 317A/0797, Compaq SMART-2 Array Controller Technology. Compaq Online Storage Controller Recovery Option eliminates a potential single point of failure in RAID arrays connected to a single controller by mating two SMART-2 Array Controllers as a controller pair. This combination of hardware and software, developed by Compaq, sits idle in the background under Windows NT and provides failover protection for pairs of SCSI controllers. One controller is active, while the other remains in standby mode. If the active controller fails, the Online Storage Controller Recovery Option switches traffic to the standby controller without loss of data (Figure 4). 1 0 1 0 Active Standby 1 0 1 Failed Active Device Driver Device Driver Figure 4: The controller pair is established. If the active controller fails, the standby controller is promoted to active. The Online Storage Controller Recovery Option is a natural partner to the PCI Hot Plug technology: System service continues uninterrupted after the failover, and the failed controller can be replaced without shutting the system down. This option is supported for single bus versions of ProLiant Storage System/U units in tower and rack-mount configurations. For more information about the Online Storage Controller Recovery Option, refer to white paper 066A/0797, Implementing Online Storage Controller Recovery Option Under Windows NT.

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Eliminating Single Points of Failure (cont.)
ECG0094/1197
With fault tolerance enabled, SMART-2 Array Controllers keep systems online and accessible after
a drive failure and provide automatic recovery with online sparing. Hot plug drives can be replaced
without powering the system down. In addition, the SMART-2 Array Controllers support redundant
array of independent disks (RAID) architecture. RAID is a way of storing data across multiple
drives in redundant configurations or with data striping and parity checking. The On-line Capacity
Expansion feature of the SMART-2 Array Controller allows server storage capacity to be expanded
without taking the server down. Prior to this innovation, expanding storage capacity attached to an
array controller required a time-consuming backup/reconfigure/restore cycle.
Performance, configuration, and fault management are provided by Compaq Insight Manager and
SMART-2 Array Controllers are covered by the Compaq Pre-Failure Warranty. For more
information about the SMART-2 Array Controller, see technology brief 317A/0797,
Compaq
SMART-2 Array Controller Technology
.
Compaq Online Storage Controller Recovery Option eliminates a potential single point of failure in
RAID arrays connected to a single controller by mating two SMART-2 Array Controllers as a
controller pair. This combination of hardware and software, developed by Compaq, sits idle in the
background under Windows NT and provides failover protection for pairs of SCSI controllers. One
controller is active, while the other remains in standby mode. If the active controller fails, the
Online Storage Controller Recovery Option switches traffic to the standby controller without loss of
data (Figure 4).
Device
Drive
r
Device
Drive
r
Active
Active
Standby
Failed
1
0
1
0
1
0
1
Figure 4: The controller pair is established. If the active controller fails,
the standby controller is promoted to active.
The Online Storage Controller Recovery Option is a natural partner to the PCI Hot Plug
technology: System service continues uninterrupted after the failover, and the failed controller can
be replaced without shutting the system down. This option is supported for single bus versions of
ProLiant Storage System/U units in tower and rack-mount configurations. For more information
about the Online Storage Controller Recovery Option, refer to white paper 066A/0797,
Implementing Online Storage Controller Recovery Option Under Windows NT
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